Bel'kovich Anton Arkadievich

Publications in Math-Net.Ru

1. On the existence of invariant tori for a periodic Hamiltonian system having some of characteristic indices with nonzero real part
   
   Differ. Uravn., 23:2 (1987),  192–198
2. Quasiperiodic solutions of Hamiltonian systems with a small parameter
   
   Differ. Uravn., 18:5 (1982),  886–889